JP2775541B2 - Terminal adapter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a terminal adapter for accommodating the data terminal equipment to the Integrated Services Digital Network (hereinafter abbreviated as ISDN).

[0002]

2. Description of the Related Art Conventionally, a terminal adapter for converting an external interface of a terminal to ISDN is connected to a packet-type data terminal device, a network connection communication path is established and communication is performed. Have confirmed.

[0003]

However, such a conventional terminal adapter connected to the ISDN requires a separate packet-type data terminal device in order to confirm the normality of the network connection communication path. when there is an abnormality in the connection channel even then, different in any sequence
There was a problem that it was not possible to specify whether or not a normal event occurred .

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. A terminal adapter connected to an ISDN is provided with a line activation test function so that a line can be activated without connecting a data terminal. , Which sequence
It is an object of the present invention to provide a terminal adapter having an ISDN line activation test device capable of specifying whether or not an error has occurred in the terminal adapter .

[0005]

In order to achieve the above object, the present invention provides a LAPB communication with a packet data terminal.
First LAP for transmitting and receiving data by communication protocol
LAPB between circuit B and integrated services digital network
Second LAP for transmitting and receiving data by communication protocol
B circuit, the packet type data terminal, and the first L
Receiving the notification of the result of the communication protocol with the APB circuit,
Start the communication protocol to the second LAPB circuit, and
Service integrated digital network and said second LAPB circuit
Receiving the notification of the communication protocol result with the first LA
Activate the communication protocol to the PB circuit and
Initiation of outgoing call from the data terminal of packet type and the service
The service is activated by the incoming call from the integrated digital network.
Layer activation, ID request, and
A control circuit for controlling transmission and reception of a call setup message,
The data from the second LAPB circuit is
To the B channel of the digital network,
Data from the network by the D
And a network interface circuit for sending to the channel.
The packet format data is stored in the integrated service digital network.
A terminal that accommodates the terminal and performs B-channel packet communication.
Terminal adapter, the service
Means for making a connection request for a network startup connection test with a network
And the channel specified as B-channel packet communication.
Through the network interface circuit according to the
B-ch for connection test for integrated services digital network
Network activation connection sending channel packet communication connection message
Continuity test means and the B-channel packet communication connection message.
From the integrated services digital network to the page
Monitor the message and via the network interface circuit
To determine whether the response message was received successfully.
Determining means for determining an error and when the determining means detects an abnormality
In order to determine the abnormal point on the sequence,
Abnormal display on the display means with display contents corresponding to the abnormal location
Display control means for performing
Communication with same network connection and same data link setting as communication
It is characterized by testing a road .

[0006]

According to the present invention, the network connection is activated by the line activation test setting, and the activation test result is displayed on the display means. The check for each step of the ISDN connection sequence is performed by monitoring the time from the start of layer 1 to the establishment of the communication path,
Time monitoring from ID (identification) request transmission to ID assignment, S
ABME (asynchronous extended balance mode setting) transmission to UA
(Confirmation) Time monitoring until reception, time monitoring from DISC (disconnection) transmission to UA reception is performed. This allows the packet
In this case, it is possible to activate the line without connecting the data terminal device, and to specify an abnormal point in the network connection communication sequence to the terminal adapter.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a system configuration using a terminal adapter according to an embodiment of the present invention.
Are packet data terminal devices (hereinafter DTE)
, 2 and 5 are terminal adapters for converting the external interfaces of the DTEs 1 and 4 to ISDN, respectively.
Is the network side home terminal unit (hereinafter abbreviated as DSU)
It is connected to ISDN3 via 6,7.

FIG. 2 is a block diagram showing a configuration of the terminal adapters 2 and 5 corresponding to the B channel packet communication in the present embodiment. In FIG. 2, LAPB (Link
Access Procedure-Balance
d; Balanced Link Access Procedure) Circuit 11
LAPB communication protocol is performed between the communication device 1 and
The LAPB circuit 12 performs a LAPB communication protocol with a network.
Is connected to the control circuit 13.

The network interface circuit 15 sends the data from the LAPB circuit 12 to the B channel of the ISDN 3 and the data from the control circuit 13 to the D channel of the ISDN 3.
Send to channel.

The operation panel 14 includes a key 14a for setting a network activation test and a liquid crystal display 14b for displaying test results.
It has.

The control circuit 13 receives the notification of the communication protocol result of the DTE 1 and the LAPB circuit 11 and activates the LAPB circuit 12 for the communication protocol. Further, upon receiving the notification of the communication protocol result between the ISDN 3 and the LAPB circuit 12,
The communication protocol is started to the LAPB circuit 11. Further, by starting the call from the DTE 1 and starting the call from the ISDN 3, the IS
The transmission / reception of the layer 1 activation, the ID request, and the call setting message is performed with the DN 3.

FIG. 3 shows a line activation test sequence of the terminal adapter 2 corresponding to the B channel packet communication in the present embodiment (the same applies to the terminal adapter 5). Hereinafter, the control procedure will be described.

The terminal adapter 2 includes an operation panel 14
In response to the activation of the line activation test, the layer 1 is activated to the ISDN 3, and if the establishment of the layer 1 is received, an ID request is transmitted, and the ID assignment is received from the ISDN 3 in response to the request. After that, the terminal adapter establishes a data link of the call control D channel to the ISDN 3 by using the SA.
A BME is transmitted, and the acknowledgment message UA is received from the ISDN 3 in response to the BME. Thereafter, a call setup message is sent from the terminal adapter to the ISDN 3 to establish a communication path with the network, and a response message is received.

When the communication path is established, the SABM is transmitted to establish the data link of the B channel, and the confirmation message UA is received. After that, in the B channel packet communication state, the ISDN changes to RNR (unreceivable),
If the RR (receivable) is sent, the terminal adapter receives it. Then, after confirming the B channel packet communication state, it sends out a DISC for disconnecting the data link and receives a UA.

To disconnect the communication path, the terminal adapter sends a disconnect message, receives a release message, and sends a release complete message. Then, for disconnecting the data link of the call control D channel, DISC is transmitted and UA is received.

Next, the operation of the line activation test will be described in detail with reference to the flowcharts shown in FIGS.

In FIG. 4, when a line activation test is performed by operating the keys on the operation panel 14, "LA-TEST" is displayed on the display 14a of the operation panel 14 in step S101. In step S102, layer 1 is activated, and it is determined in step S103 whether layer 1 has been established. If it is determined that the layer 1 has not been established, the process proceeds to step S104, and it is monitored whether or not the layer 1 has been established within a certain period of time. -NG2 "is displayed, and the test ends. If it is determined in step S103 that layer 1 has been established, an ID request is transmitted in step S106, and it is determined in step S107 whether ID assignment has been received. Here, if it is determined that the ID assignment has not been received, the ID assignment is waited for a predetermined time in step S108, and if it is not received within this waiting time, "LA-NG3" is displayed on the operation panel 14 in step S109. And end the test.

On the other hand, if it is determined in step S107 that the ID assignment has been received, the flow advances to step S110 in FIG. 5 to transmit SABME. Then, the next step S1
At 11, it is determined whether a UA has been received. If the UA is not received, the UA reception is waited for a predetermined time in step S112. If the UA is not received within the waiting time, the process proceeds to step S1.
At 13, it is determined whether the number of retransmissions of SABME has been transmitted N times. If it has not been transmitted N times, step S110 is performed.
And sends SABME. If N times have been sent, the flow advances to step S114 to display "LA" on the operation panel 14.
-NG8 "is displayed, and the test ends.

If it is determined in step S111 that a UA has been received, a call setup message is sent to ISDN in step S115, and it is determined in step S116 whether a response message from ISDN has been received. here,
If no response message has been received, step S117 is performed.
In step S118, "LA-NG9" is displayed on the operation panel 14 in step S118, and the process proceeds to step S145 in FIG.

If it is determined in step S116 that the response message has been received, the process proceeds to step S11 in FIG.
Proceed to 9 and send SABME to ISDN. Thereafter, it is determined in step S120 whether a UA from the ISDN has been received. Here, when it is determined that the UA has not been received, the reception of the UA is waited for a predetermined time in step S121, and when the UA cannot be received within this waiting time,
In the next step S122, it is determined whether the number of retransmissions of SABME has been transmitted N times. If it has not been transmitted N times, the process returns to step S119 to transmit SABME. Also,
If it has been transmitted N times, "LA-NG5" is displayed on the operation panel 14 in step S123, and step S1 in FIG.
Proceed to 40.

If it is determined in step S120 that a UA has been received, a link disconnection start timer is started in step S124, and it is determined in step S125 whether an RNR has been received. If the RNR is received, step S126
To set the network busy flag and proceed to step S127. Also, when the RNR is not received in step S125, the process proceeds to step S127, and it is determined whether the RR is received. If RR has been received, step S128
Resets the network busy flag. When RR is not received and after the network busy flag is set, it is determined in step S129 whether DISC has been received. DIS
If it is determined that C has been received, step S13
0, the UA is transmitted from the ISDN, and the next step S131
Displays "LA-NG6" on the operation panel 14, and proceeds to step S140 in FIG. DISC in step S129
Is determined not to be received, it is determined in step S132 whether a predetermined time has elapsed since the start of link disconnection. If not, the process returns to step S125, and if it has elapsed, the process proceeds to step S133 in FIG. .

In step S133, it is determined whether the network busy flag has been set. If the flag is set, “LA−” is displayed on the operation panel 14 in step S134.
NG7 "is displayed. If it is not set, a DISC is sent to ISDN in step S135. Thereafter, in step S136, it is determined whether a UA from ISDN has been received. If the UA is not received, the reception of the UA is waited for a predetermined time in step S137. If the UA cannot be received in this waiting time, it is determined in step S138 whether the number of times of retransmission of the DISC has been transmitted N times. If it has not been transmitted N times, the process returns to step S135 to transmit the DISC. If the transmission has been performed N times, "LA-NG" is displayed on the operation panel 14 in step S139.
6 "is displayed, and the routine goes to Step S140.

If it is determined in step S136 that a UA has been received, a disconnection message is sent to ISDN in the next step S140. Then, the next step S1
At 41, it is determined whether a release message has been received from the ISDN. If it is received, in step S142, IS
A release completion message is sent to the DN, and the process proceeds to step S145 in FIG. If the release message has not been received, the process proceeds to step S143, and waits for reception of the release message for a predetermined period of time. Send to terminal adapter. If the fixed time has not elapsed in step S143, the process returns to step S141.

In step S145 of FIG. 8, the terminal adapter sends a DISC to the ISDN. Then, in the next step S146, it is determined whether the terminal adapter has received a UA for DISC. UA
If it is determined that no has been received, step S14
7 waits for the UA reception for a certain period of time. If the UA cannot be received even after the waiting time elapses, the DI is determined in step S148.
It is determined whether the SC has been retransmitted N times. Here, if it has not been transmitted N times, the process returns to step S145 and the DISC is transmitted again. Further, when it is determined that the transmission has been performed N times, or in step S146, the UA
When it is determined that has been received, the process proceeds to step S149. In step S149, the operation panel 1 is determined based on the result of the determination that the UA has been received and the result of the determination that the UA has been transmitted N times.
4 shows that the result of the start-up test is abnormal.
"G" is displayed. If it is displayed, the test ends. If it is not displayed, "LA-OK" indicating that the result of the startup test is normal is displayed on the operation panel 14 in step S150, and the test ends.

As described above, in the present embodiment, the line can be activated without connecting the DTE as in the prior art, and all points of the connection process with the network are checked, and the check results are displayed, thereby displaying the sequence. Abnormalities can be identified. Therefore, the abnormal part of the terminal adapter
It is also possible to identify.

[0027]

According to the present invention, as is apparent from the above-described embodiment, the line can be activated without connecting the DTE by providing the terminal adapter with the activation means for the line activation test and the means for displaying the test result. It can check all points in the network connection process and display the check results to indicate differences in the network connection communication sequence.
There is an effect that the usual can be specified.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram using a terminal adapter according to an embodiment of the present invention.

2 is a block diagram showing the configuration of the Terminal adapter in an embodiment of the invention.

FIG. 3 is a sequence diagram at the time of a line activation test of the terminal adapter of FIG. 2;

FIG. 4 is a flowchart showing an operation procedure at the time of a line activation test of the terminal adapter of FIG. 2;

FIG. 5 is a flowchart showing an operation procedure at the time of a line activation test.

FIG. 6 is a flowchart showing an operation procedure at the time of a line activation test.

FIG. 7 is a flowchart showing an operation procedure at the time of a line activation test.

FIG. 8 is a flowchart showing an operation procedure at the time of a line activation test.

[Explanation of symbols]

 1,4 Packet form data terminal (DTE) 2,5 Terminal adapter 3 Integrated Services Digital Network (ISDN) 6,7 Home terminal unit (DSU) 11,12 LAPB circuit 13 Control circuit 14 Operation panel 15 Network interface

Claims (3)

(57) [Claims] 1. LAP between a packet type data terminal and
A first LA for transmitting and receiving data according to the B communication protocol
LAP between PB circuit and integrated services digital network
A second LA for transmitting and receiving data according to the B communication protocol
A PB circuit, the packet type data terminal, and the first
Before receiving notification of the communication protocol result with the LAPB circuit
Activating the communication protocol to the second LAPB circuit,
The integrated service digital network and the second LAPB cycle
Receiving the notification of the result of the communication protocol with the path,
In addition to starting the communication protocol to the APB circuit,
Initiation of transmission from the packet data terminal and the service
The service is activated by an incoming call from the integrated digital network.
Layer activation, ID request, and
And a control circuit for controlling transmission and reception of call setting messages.
The data from the second LAPB circuit is integrated with the service
Sending to the B channel of the digital network;
The data from the circuit is transferred to the D
A network interface circuit for sending to the channel,
The packet format data is stored in the integrated service digital network.
And perform B-channel packet communication
In a terminal adapter, and activation means for performing a connection request network boot connection test between the Integrated Services Digital Network, sequence being defined as a B-channel packet communication
According to the network interface circuit.
B channel for connection test to the service integrated digital network
Network-initiated connection test that sends a packet communication connection message
Test means and a response to the B-channel packet communication connection message.
Monitors response messages from the integrated service digital network.
The response message via the network interface circuit.
And determining means sage you determine whether it has been successfully received, if the determining means detects the abnormality, the sequence
To determine the abnormal location in the sequence and respond to the sequence abnormal location
A terminal adapter , comprising: display control means for causing the display means to display an error based on display contents, and testing a communication path by the same network connection and the same data link setting as the B channel packet communication. 2. The method according to claim 1, wherein the determining unit determines all of the sequences.
Is determined to be normal, the display control means
Displays a display content indicating normal on the display means.
The terminal adapter according to claim 1, wherein
Ta. 3. The apparatus according to claim 2, wherein said judging means detects an abnormality in said sequence.
And the display control means displays an abnormality display on the display means.
If performed, then the network initiated connection test means
B-channel packet communication connection message for connection test
End transmission and end the connection test
The terminal adapter according to claim 1.